Roller-guide for band-saws.



PATENTED E. G. LIPPMANN & R. MCKINNEY. ROLLER GUIDE FOR BAND SAWS.

APPLICATION FILED JULY 12, 1907.

JAN. 14, 1908.

2 SHEETS-SHEET l.

4 No. 876,816. PATENTED JAN.14, 1908. E. C. LIPPMANN & R. MOKINNEY.

ROLLER GUIDE FOR BAND SAWS.

APPLICATION FILED JULY 12, 1907.

2 SAEETSSHEET 2.

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ELZA G. LIPPMANN AND ROBERT MCKINNEY, OF SIMMONS SWITOH, ARKANSAS.

ROLLER-GUIDE FOR BAND-SAWS.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed July 12, 1907- Serial No. 383-543.

To allwhom it may concernr.

Beit known that We, ELZA C. LIPPMANN and -RoBERT MOKINNEY, citizens of the'United States, residing at Simmons Switch, in the county of WVoodruff and State of Arkansas,

have invented certain new' and useful Improvements in Roller-Guides for Band-Saws, of which the following is a specification, reference being had to the accompanying draw- 'ings.

My invention relates to improvements in roller guides for band saws and consists of the novel construction and the combination and arran ement of parts hereinafter ded claimed.

The ob'ect of the invention is to provide a guide of this character which is simple, strong and durable in construction and which may be readily ad'usted for use in connection with band saws 0 different sizes.

The above and other objects of the invention are attained in the referred embodiment of the invention illustrated in the accompanying drawings, inwhich Figure 1 is'a perspective view; Figs. 2 and 3 are vertical sections; Figs. 4 and 5 are horizontal sections; Fig. 6 is a perspective of the body, and Fig. 7 is a simi ar view of the adjustable bearing block.

In the drawings 1 denotes the body of my im roved band saw guide, which is preferably cast in the form of a rectangular block having in its bottom edge' intermediate its ends a transverse slot or opening 2 to provide two depending arms or lugs 3, 4. Pro

fleeting forwardly from the front face of the lug 4 is an enlargement or stationary bearing block 5 on which is journaled one of two do rollers adapted to engage the opposite fi lies of the band saw S. These rol ers are preferably formed with (grooved peripheries 8 and they are mounte for rotation upon two bolts 9, 10. The bolt 9 which forms a journal for the roller 6 is screwed into a threaded opening 11 in the stationary bearing block 5, and the bolt 10 which forms a journal for the roller 7 is screwed intoa threaded opening 12 formed in the front end of a rectangular bearin block 13 which is ad'ustably mounted in t e openi or recess This adjustab 0 bearing block 13 has a reduced rear end 14.which rojects into the opening 2 and forms a shou der 15 adapted to engage the 'frontface of the bod asshown.

T e reduced rear end. 1 40f thebearingblock 13 is formed with a rectangular opening 16 adapted to receive the similar shaped body portion 17 of a supporting bolt 18 which re-- tains the bearing block 13 in the body. Said bolt has a flat head 19 upon the lower end of its body for engagementwith the bottom of the block 13 and from the upper end of its bod 17 projects a reduced cylindrical stem or s ank 20 which passes through a vertical opening 21 in the body 1 and has a threaded projecting portion to receive a clamping nut 22. The bearing block 13 is of less length than the opening 2 in the body and its vertical opening 16 is elongated, so that when the nut 22 is unscrewed to loosen the bolt or hanger 18 said bearing block may be adjusted in the opening 2 in the body so as to position its roller 7 nearer to or further from the roller 6 and thus adapt said rollers toreceive a band saw of any thickness. When the nut 22 is tightened the head 19 of the bolt or hanger 18 tightly clamps the bearing block 13 in the top of the opening 2 in thebody 1 and with the shoulder 15 engaging the outer face of the body so that the bearing block cannot twist or turn upon the bolt or hanger.

To permit the bearing block to be readil adjusted when the nut 22 is loosened I pre erably employ a set screw 23 arrangedin a threaded opening 24 in the lug 3 so that its inner end will impinge against the bearing block as clearly shown in the drawing. The

back edge of the saw is lguided and supported by its engagement Wit a disk roller 24 arranged in a plane parallel to that of the rollers 6, 7 and secured upon a spindle 25 which rotates in a cylindrical hearing or sleeve 26 in turn arranged in a transverse opening 27 in the upper portion of the body 1 adjacent to one s1de of the same. The spindle 25 is re tained in the bearing 26 by the saw engaging the disk 24, and said bearin is adapted to slide forwardly and rearwardl ing 27 and is held stationary in an adjusted position by means of a set screw 28 arranged in the threaded opening in one side of the,

body-and adapted to impinge against said bearing. This adjustment of the bearing y in the open-- i permits the disk 24 to be adjusted forwardly.

in the drawings. Said face of the disk is T preferably concave or recessed so as to form aflat surface 29 against which the back edge of the saw bears. While the body of the devicemay be supported upon the machine in any suitable manner I preferably provide an opening 30 in the body 1 to receive a suitable support and a set screw 31 which retains the body'upon said support.

From the foregoing it will be seen that my improved guide will effectively steady and guide thesaw with little or no friction and without danger of breaking the same. The three rollers are the only parts of, the device that contact the saw and they turn in the direction the saw moves so that there islittle or no friction. The side rollers 6, 7 effectively prevent the saw from shifting or sprin ing laterally and the disk roller. 22 rigidfy supports the back edge of the same so that it cannot yield or ive in a backward direction. By means of the various adjustments the three rollers may be so positioned with respect to each other that they will effectively guide and brace band saws of different sizes.

Among other advantages of my invention may be mentioned the ease with which the parts may be adjusted to take up wear and to accommodate saws of diiferent widths and thickness; the effective manner in which the tension of the saw is preserved so that there will be less liability of molecular crystallization, and hence a reater life for the saw the ease with which t e parts may be oiled; the

steady and effective manner in which the saw will be held so that perfect work may be done, and. the comparatively small amount of friction and hence little or no danger of the parts heating. If desired oil cups may be provided to supply the lubricant to the bearings and ball bearings may also be provided to reduce friction. The opposing guide wheels preferably are turned smaller at the back than at the front edge to cause them to more effectively uide the saw but if desired said wheels may e made of rubber or fitted with rubber rims when it becomes necessary to do various fancy or particular work.

Having thus described my invention what I claim is:

The herein described band saw guide comprising a body formed in its upper portion with vertical and horizontal openings arranged adjacent to itsopposite sides and also formed in its bottom beneath the vertical opening with a recess or open portion which provides two dependin arms, one of which atter has a transverse t readed aperture and the other a forwardly projecting enlargement forming a stationar bearing block, a transverselyslidable bloc arranged in the recess or open portion of the body between said arms and formed with a reduced rear portion to provide the shoulder 15 to engage the front face of the body, said reduced rear portion of the slidable bearing block being formed with a vertical slot to register with the vertical opening in the body, the front ortion of said slidable bearing block being orm'ed with a threaded socket, a suspending and clamping bolt passed vertically through the slot in the slidable bearing block and through the vertical opening in the upper portioniof the body, the head of said bolt being enga ed with the bottom of the slidable bearingb ock, aclampin nut upon the upper threaded end of the boft engaged with the top of the body for securing said slidable bearing block in an adjusted position, a set screw arranged in the threaded opening in one of said arms for sliding the slidable bearing block upon said bolt toward the stationary bearin block when the bolt is loosened, hcade screws engaged with the threaded sockets in the two bearing blocks, opposin guide rollers j ournaled upon said screws an saw, a sleeve s idable in the horizontal opening in the upper portion of the body, a set screw for securing said sleeve in an adjusted adapted to engage the opposite sides of the position and a guide disk journaled in said sleeve and adapted to engage the back edge of the saw, substantially as set forth.

In testimony whereof we hereunto affix our signatures in the presence of two witnesses. ELZA O. LIPPMANN. ROBERT MoKINNEY. Witnesses: W. A. MORGAN,

W. L. Woons; 

